Cleaning machines with dual outlets



Sept. 9, 1958 v P. WOLLNER EIAL 2,851,053

CLEANING MACHINES WITH DUAL OUTLETS Filed May 13. 1953 I, s sheets-sheet 1' INVENTORS 3/ ATTORNEYS Sept- 1953 P.- WOLLNER ET AL 2,851,053

"'ELEAN NG MACHINES WITH DUAL OUTLETS Filed May 13, 1953 5 Sheets-Sheet 2 ATTORNEYS CLEANING MACHINES WITH DUAL OUTLETS Filed May 15, 1953 3 Sheets-Sheet 3 INVENTORS P404. Wa44/vek, [fie/Mex; away/ere.

BY 2%M m ATTORNEYS United States Patent CLEANING MACHINES WITH DUAL OUTLETS Paul Wollner, Weehawken, and Richard H. Walter, Jr., Ramsay, N. J., assignors to Aeroil Products Company, 11nd, South Hackensack, N. J., a corporation of New ersey Application May 13, 1953, Serial No. 354,842 Claims. or. 137-435 This invention relates to cleaning devices of the type adapted to project a stream under pressure against the article to be cleaned and the invention has for an object to provide a cleaning machine adapted to simultaneously project hot or cold water, and steam in the form of continuous streams.

Another object of the invention is to provide a cleanmg apparatus adapted to receive streams of water and to convert the same into steam and hot water, and to simultaneously discharge hot or cold water and steam at predetermined quantities, temperatures, and pressures.

Still another object of the invention is to provide a cleaning machine having a dual flow of water therethrough which is interconnected for varying the flow therethrough and having a heater connected therewith by which either flow may be heated thereby to provide a flow of steam and a flow of hot water.

Still another object of the invention is to provide a cleaning machine of said character having control valves is controlled by electrical means for determining the volume of the steam and water issuing from the nozzles respectively and the pressure thereof, as well as the temperature of the water.

With the foregoing and other objects in view, reference is now made to the-following specification and accompanying drawings in which the preferred embodiment of the invention is illustrated.

In the drawings:

Fig. l is a schematic view of a dual flow water supply system for a cleaning machine constructed in accordance with the invention.

Fig. 2 is a schematic plan of the electric circuit for controlling the operating parts in the system.

Fig. 3 is a schematic view showing two of the valves in the system and a control switch in the electric circuit mounted for simultaneous movement to various operative positions.

Fig. 4 is a schematic view showing the arrangement of the ports of the valves and the setting of the switch when the same are in one position.

Fig. 5 is a schematic view showing the arrangement thereof when in another position.

Fig. 6 is a schematic view showing the arrangement thereof when in a third position.

Fig. 7 is a fragmentary view showing the position of the change-over cock for diverting the water from one system to the other.

The system is adapted for receiving water from outside 2,851,053 I Patented Sept. 9, 195 8 ice water mains in a continuous stream andfor controlling the flow thereof to a heater for supplying hot and cold water and steam at predetermined temperatures and pressures and in predetermined quantities.

The system includes a supply pipe 10 connected with a source of water supply (not shown) and having branch pipes 11 and 12 extending into tanks 13 and 14 respectively through float valves 15 and 16 which automatically maintain a predetermined lever of the water in the tanks. A tank 17 is connected with the system bymeans of a pipe line 18 and connected with the tank is a motor driven pump 20 for pumping a chemical solution from the tank 17 to the tanks 13 and 14 through a pipe line .21 connected with manual control valves 23 and 24 leading to said tanks respectively. A manual control valve 25 is arranged in the pipe line 18 for controlling the flow of water to the tank 17 and a temperature control valve 26 is arranged in the said pipe line to permit of the flow-of water to the tank when the same is approximately F.

The system also includes a steam nozzle or gun, indicated generally by the reference character 30 and a water nozzle or gun indicated generally by the reference character 31 together with means for providing a continuous discharge of steam through the steam nozzle or gun 30 in varying quantities and a continuous discharge of water through the nozzle or gun 31 in varying quantities, pressures and temperatures. The aforesaid means includes two motor driven pumps 32 and 33 which are connected in series by a pipe line 34 extending from the discharge of the pump 33 to the inlet of the pump 32. A pipe line 35 connects the inlet of the pump 33 with the tank 13 and a first feed pipe line 36 is connected with the discharge of the pump 32 and this line includes a check valve 37 for preventing flow of the water toward the pump. The pipe line 36 is connected with a port 38 of a four-way manual control valve 39. A first discharge pipe line 40 extends from a port 41 of said control valve and is connected with the nozzle or gun 31. A check valve 42 is arranged in the pipe line 40 to prevent flow of the water toward the valve 39 and a pressure responsive switch 44 is connected with the pipe line 40 for limiting the pressure in said pipe line to any desired amount such as 300 pounds per square inch.

The pipe line 36 is connected with a by-pass line 46 which extends into the'tank 13 and is provided with a by-pass valve 47 which is set to open and by-pass' water back to the tank 13 if the pressureiin the discharge line 36 exceeds the desired pressure, such as 300 pounds per square inch, in accordance with the setting of the pressure responsive switch 44. A by-pass line 48 is also connected with the line 36 and connects with the by-pass line 46' and this line includes a control valve 50 for bypassing water from the line 36 to the tank 13 when water flowing through the line 36 is in'excess of a desired flow, such as 540 gallons per hour. The control valve 50 may be of the pressure operated diaphragm type. A solenoid valve 51 is also arranged in the by-pass line 48 which valve is normally closed to prevent flow through said by-pass line and which is opened when the solenoid thereof is energized by the closing of a three-position manual control switch 52.

The system also includes two motor driven pumps 54 and 55-which are connected in series by a pipe line 56 connected with the discharge of the pump. 55 and the inlet of the pump 54. A pipe line 57 connects the'inlet of the pump 55 with the tank 14 and a second feed pipe line 58 is connected with the discharge of the pump'54 and this line is connected with one end of a second heating coil 59 and includes a check valve 53 for preventing flow of the water toward the pumps. The heating coil 59 is connected by a pipe line 60with. a port 61 of a four-way manual control valve 62. A 'portf63 in said 3 valve is connected by a pipe line 64 with one end of a first heating coil 65. The opposite end of said first heating coil is connected by a pipe line 66 with a port 67 in the four-way manual control valve 39. A port 68 in said control valve-has a second discharge pipe line 69 leading therefrom and which is connected with the steam nozzle or gun 30. Alcheck valve 70 is arranged in said pipe line 69 to prevent flow of the water toward the valve 39. Two pressure responsive switches 72 and 73 are connected with the pipe line 69 for limiting the pressure in said pipeline to desired different pressures such as 110 to300 pounds per square inch respectively. A manual change-overcock 74 is. also arranged in the pipe line 69 which is of the three-way typeand is connected at one outlet-with the pipe line 40.

A pipe line 77 leads from a port 78 in the control valve 62 and is connected with the pipe line 69 betweenthe change-over cook 74 and the check valve 70. A pipe -:line 80 leads from a port,81 in said control valve 62 and is connected 'to the pipe line 40 between the pressure responsive switch 44 and the check valve 42. A check valve 82 and a check valve 83 are arranged in the pipe lines 77 and 80 respectively for preventing vflow of the water toward the control valve 62.

--Thc second feed pipe line58 is connected with a bypass line 85 which. extends into the tank 14v and has a by-passvalve 86 arranged in said line which is set to open and by-pass water back to the tank 14 when the pressure in the line 58 exceeds the desired pressure, such as 300 pounds per square inch in accordance with the setting on thepressure responsive switch 44. A by-pass line 87 is also connected with the pipe line 58 and with the bypass line 85 between the by-pass valve 86 and the tank 14. The by-pass line 87 includes a control valve 88 for by-passing water from the line 58 to the tank 14 when water flowing through the line 58 is in excess of a desired flow, such as 360 gallons per hour. The control valve 88 may be of the pressure-operated diaphragm type. -A solenoid valve 89 is arranged in the by-pass line 87 and is normally closed to prevent the flow of. water through said by-pass line. The said valve automatically opens when the solenoid thereofis energized by the closing of the three-position manual control switch 52.

r The coils 59 and 65 are arranged in a boiler 90which is heated by a downwardly projecting flame jet issuing from a burner 91 arranged in the boiler adjacent the top thereof, andvalves 93 and 94 are connected with the pipe lines 58 and 66 for cleaning the coils 59 and 65. 'A pipe line 95 branches from the pipe line 66 and has branches arranged in "the boiler '90 for cleaning soot from the coils. A valve 96 normally maintains the pipe line 95 in closed relation. A strainer 97 is arranged in the pipe line for filtering the water entering the system. A compound basket 98 is arranged in the tank 17 for containing-chemicals to form the chemical solution -in the tank.

The four-way manual control valves 39 and 62 and the manual control switch 52 are connected with a handle 99 for simultaneous movement to different positions to provide for different operating conditions in the system. Whenthe handle member is moved to position the control valves 39 and 62 'in a first position shown in Figs. 1 and 4"of the drawings, the manual control switch 52 is arranged in the position shown in Fig. 2 of'the drawings. The change-over cock 74 is then manually set to the position shown in Figs. 1 and 4 of the drawings and when so arranged, the system will provide for a 'flow of 540 gallons of water per hour from the pumps 54 and 55 which will be heated in the coils 59 and 6S and will then pass through the pipe line 66 and the pipe line 69 and be discharged from the steam gun or nozzle 30 in the form of steam or hot water approximately the temperature of steam. At the same time, the pumps 32 and 33 will provide 600 gallons of water per hounwhich will pass through the pipe line 40 and be discharged through the water nozzle or gun 31 at the temperature of the Water entering the system.

In another position of the handle 99, the control valves 39 and 62 will be disposed in the second position shown in Figs. 3 and 5 of the drawings so as to connect the pipe line 36 with the pipeline 66 through the control valve 39, and the coil 65 with the pipe line 77, and the pipe line 69 through the control valve 62, and the coil 59 with the pipe line 80 and thepipe line 40. The manual control switch 52 will be set as shown in Figs. 3 and 5 of the drawings and the change-over cock 74 will remain unchanged to provide a continuous flow through the pipe line 69. When in this position, the pumps 32 and 33 will provide 360 gallons of water per hour which will pass through the pipe line .36, the pipe line 66, and the coil 65 and be discharged through the pipe line 77, the pipe line 69 and as steam or hot water approximately the temperature of .steamthrough the steamgun or nozzle 30. The pumps 54.and 55 will provide 600 gallons of water per hour which will pass through the pipe line 58, the coil 59 and through the pipe line 80 and the. pipe line 40 and be discharged through the water gun or nozzle 31 at a temperature of approximately 85 Fahrenheit .above inlet temperature.

Another setting of the handle 99 will position the control valves 39 and 62 in the position shown in Figs. 1 and 4 of the drawings and the manual control switch 52 will be positioned as shown in Figs. 2 and 4 of the drawings. For this position the change-over cock 74 will be moved to the positionshowninFig. 7 of thedrawings in which the said valve diverts the waterfrom the pumps 54 and 55 heated by the; coils. 59 and to the pipe line 40 to provide a flow such as 600. gallons of water per hour at a temperature such as approximately 180 Fahrenheit issuing from the water gun or nozzle 31. In this positionthe pumps 32 and 33 are not in operation.

Thepumps 32 and 33 are driven by an electric motor in a 220 volt three phase power. line .111. The pumps 54 and 55 are driven by a threetphase motor 112 which is connected with the power line 111 by a three phase branch powerline 113. Arranged in the power line 111 is a three pole solenoid starter switch 114 and arranged in the powerline 113 is a three .pole solenoid starter switch 115. Branching from the power line 111 is e220 volt primary circuit 116 which is connected with .the primary of a 220 volt single phase step-:downtransformer 117 having 110 volts acrosslthe secondary circuit .118 thereof. A double pole. manual switch 119 has one pole .120. thereof arranged toclose theprirnary circuit 116 while the opposite pole 121 of said switchis arranged to close thesecondarycircuit 118 to start the motor 110 by the closing of thestarterswitch .114 .with the closing of the secondary circuit. A double pole manual switch 123 has one pole 124 thereofarranged to close the primary circuit 116, while the opposite pole 125 of said switch is arranged .to close the. secondary circuit 118 to starhthemotor 112- by .the closing of the starter ture point .134- a conductor wire leads to the two terminals on one side of a norrnally'open control relay 137 and from one of the terminals on t-h e opposite side thereof a conductor wire=138 leadsto the' pole' 121 of the double pole manual switch 119' andfrom said pole a conductor wire 139 leads to the other side of the solenoid of the starter switch 114. Thesolenoid of the starter switch 115 is also said secondary circuit 118 lay s.

by 'a conductor wire 142 leading from one side of said solenoid to the normally closed pole 128 of the time delay relay 129 and from said time delay relay bythe conductor wire 130 leading to the juncture point 131 and from said juncture point by the conductor wire 132 to the juncture point 133 and thence through said secondary and by said conductor wire 135 to the two terminals on one side of said normally open control relay 137 and by a conductor wire 143 from one of the terminals on the other side to the pole 125 of the manual switch 123 and from said pole 125 by a conductor wire 144- ieading to the other side of the solenoid of the starter switch 115.

The solenoid of the control relay 137 is connected in the secondary circuit by a conductorwire 146 leading from one side of said solenoid to the juncture point 133 through the switch element 147 of the pressure responsive switch 44 and by a conductor wire 148 leading from the other side of said solenoid to the juncture point 149 through the switch elements 150 and 151 of the pressure responsive switches 72 and 73. Provision is made for bypassing the switch element 151 of the pressure re-. ,sponsive switch 73 by the conductor wires 153 and 154 leading from the opposite sides of said switch element to opposite terminals of a single throw double acting re- The solenoid of said relay 155 is connected on one side by a conductor wire 156 with a terminal 157 of 'the manual control switch 52, the opposite side of said :solenoid being connected by a conductor wire 158 to the juncture point 159 and by a conductor wire 160 to the conductor wire 146. The conductor wire 161 leads from the conductor wire 148 to the switch terminal 162 of said manual control switch 52. The single throw relay 155 is normally open to retain the switch element 151 of the pressure responsive switch 73 in circuit and the said relay is normally close to by-pass a thermostatic control switch 164 through the conductor wires 165.

and 166, the thermostat of which extends into the pipe line 69 and which may be set for maintaining the water flowing therethrough at any desired temperature such as 180 Fahrenheit. The solenoid of the solenoid valve 51 is connected on one side by a conductor wire 168 with the terminal 169 of the manual control switch 52 and on the other side the solenoid is connected by a conductor wire 170 with the conductor wire 160. The solenoid of the solenoid valve 89 is connected on one side by a conductor wire 171 with a terminal 172 of said manual control switch 52 and on the opposite side the solenoid is connected by a conductor wire 173 with the conductor wire 146. p It follows therefore that when either of the switches 119 and 123 are closed the secondary circuit 118 will be energized and both poles of the control relay 137 will be closed to complete the circuits with the solenoids of the starter switches 114 and 115 to thereby close said switches and start the motors 110 and 112 respectively.

In the event that the pressure in the pipe line exceeds the setting on the pressure responsive switch 44 such as 340 pounds per square inch, the switch element 147 thereof will be opened to break the circuit with the solenoid of the control relay 137 to thereby stop the motors. Similarly, if the pressure in the pipe line 69 exceeds the setting on the pressure responsive switch 72, such as 300 pounds per square inch, the switch element 150 thereof will be opened to break the circuit with the solenoid of the control relay 137 tobreak the circuit with the solenoids of the starter switches 114 and 115 to thereby stop the motors. When the pressure responsive switch 72 is in operation, the pressure responsive switch 73 is by-passed by the setting of the manual control switch 52 to place the switch element thereof on the terminal 157 whereby the circuit will be established through the conductor wires 15.3 and 154 to bypass the switch element 151 of said pressure responsive switch 73. When the pressure in the pipe line 69 is to be regulated by the pressure responsive switch 73, the rela'y155 is opened for establishing the circuit through the switch element 151 of said pressure responsive switch 73, and in the event that the pressure in said pipe line exceeds the setting on said pressure responsive switch such as pounds per square inch, the switch element 151 thereof will be opened to break the circuit with the solenoid of the control relay 137 to thereby discontinue operation of the motors.

. The double acting time delay relay 129 is in series with a normally closed single pole relay 175 by a conductor wire 1'76 leading from a connection with the conductor wire to one of the terminals of said relay and by a conductorwire 177 leading from the other terminal thereof to one of the terminals of the delay. relay 129. The other terminal of said delay relay 129 is connected by a conductor wire 178 leading'to the juncture point 149. The solenoidof the relay is in a secondary circuit of a step-down transformer 179 having 110 volts across the primary thereof and 24 volts across the secondary. The primary of the said transformer is connected in the secondary circuit of the transformer 117 and the secondary thereof is connected in series with the solenoid of the relay 175 by a conductor wire 180 and in series with two low water control electrodes 181 and 182 by conductor wires 183 and 184. The electrodes 181 and 182 are normally immersed in the tanks 13 and diagrammatically illustrated in Fig. 2 of the drawings and which are connected by means of the piping 21 shown in Fig. l of the drawings and diagrammatically illustrated in Fig. 2 of the drawings whereby in the event that the water from the supply main 10 should be interrupted or discontinued so that the water in the tanks falls below the said electrodes, the normally closed pole 128 will'be opened to break the circuit with the starter switches 114 and 115 to thereby discontinue operation of the motors 110 and 112. The normally open pole 186 of the delay relay 129 will automatically close when the normally closed pole 128 thereof is opened as aforesaid. When water again enters the tanks 13 and 14 to immerse the electrodes, the circuit controlling the starting switches 114 and 115 remains open until the switches 119 and 123 are opened and then moves to closed relation. Whenthe said switches are opened so as to break the circuit the relay 129 will automatically function to open the pole 186 and to close the pole 128. Closing of the switches 119 and 123 will then effect a closing of the starting switches 114 and 115 to place the pumps 1n operation.

Connected in parallel with the terminals of the solenoid of the starter switch 115'is a burner control circuit having a manual switch 188 for opening andclosing the circuit with the burner and which is in series with one side of the solenoid coil of said starter switch by a conductor wire 189. A normally open pressure switch 190, a thermostatic control switch 191 and the thermostatic control switch 164 are in series'and are connected with the other pole of said solenoid by a conductor wire 192. Also arranged in series in said circuit is a protectostat switch 193 and a fuel solenoid valve 194, the protectostat switch being normally open and closing upon the required heat in the boiler 90 in four seconds time. The

fuel solenoid valve 194 controls the flow of fuel to the burner 91 for heating the boiler 90. Shunted across the conductor wires 192 and 189 is a single pole ten second time delay relay 195 and a single pole four second time delay relay 196, the poles of which are connected by conductor wires 197 and 198 with the solenoid of the fuel solenoid valve 194. v j

. The protectostat switch 193 extends into the boiler 90, as shown in Fig. l, and is subjected to the heat therein. The fuel solenoid valve 194 is arranged in the fuel line 199 leading to the burner 91 as illustrated in Fig. l of the drawings. The protectostat switch 193 functions to break the circuit with the solenoid of the solenoid valve 194 in the event of improper combustion in the boiler 90 7 which may be due to ignition failure or improper flow of fuel through the fuel line 199.

The time delay relay 195 isnormallyclosed so as to establish the circuit-to the solenoid valve 194 thereby permitting the flow of fuel to the burner. If the flame is of the proper temperature, the protectostat switch 193 will close to complete the circuit in parallel with the time delay relay 195. The time delay relay 195 then opens so that the circuit with the solenoid valve 194 is dependent upon the action of the protectostat switch 193.

The four second time delay relay 196 is for the purpose of providing a delay of four seconds in the closing of the circuit with the solenoid valve 194 so that the combustion chamber of the boiler 90 can be supplied with air from the blower admitted adjacent the burner'before the solenoidvalve 194 is opened to admit fuel to the burner.

When the switch 188 in the burner control circuit is moved to closed relation, the fuel solenoid valve 194 is in circuit through-the time delay relay 195 and when four seconds have elapsed the timedelay relay 196 will be moved to close the circuit with the solenoid valve thereby opening the fuel line 199 for the flow of fuel to the burner. When the flame has reached the proper intensity the protectostat switch 193 will'be moved to closed relation to maintain the circuit with the solenoid valve since the time delay relay 195 has moved to open relation.

Branching from theprimary circuit 116 is a primary ignition circuit 201 of a step-up transformer-202, the secondary circuit 203 of which is connected with the ignition electrodes 204 which are located adjacent tothe burner 91 for igniting the fuel issuing therefrom. The primary ignition circuit has apotential of 212 volts, while the potential across the electrodes is 10,000 volts.

While Fig. l of the drawings discloses two pumps 32 and 33 arranged in series for pumping water through on'e of the systems and two pumps 54 and 55are shown in Fig. l coupled in series for pumping water through the othersystem, it is to be understood that a single pump may be used in each system to provide therequired flow of water and without departing from the spirit of the invention a single pump may be utilized for-supplying water for both systems. In this instance, the pump would be connected with the motor 112 and the-motor-110 together with the solenoid starter switch 114' and the manual switch 119 would-be eliminated.

The pressure switch 190 is connected in the pipe line between the coils 59 and 65 as shown in Fig. l of the drawings. The said-switch is normally open and is set to close atapproximately 50 pounds pressure of the water in thepipe line to close the circuit from one ofthe poles of the solenoid of the starter switch 115 to the thermostatic control switch 191. In other words, the circuit between the solenoid of the starter switch 115 to the thermostatic control-switch 191 remains open after the pressureof the water in the coils is below 50 pounds, so that the solenoid valve 194 remains closed against the flow of fuel oil to the burner when the water in the pipe line is below SOpoundspressure.

What is claimed is:

1. In a cleaning machine, a 'piping system having first and second dischargelinesand firsta'nd second feed lines provided with pump means for producingaflow of liquid through eachfeed line, a'heater having first and second heater ,coils, a valve means connected between the coils and with both discharge lines for placingthe coils in series when said valve means is in a first position and for connecting the coils with the discharge lines respectively when said valve means is in a second position, said second feed line being connected with said second coil, and a second valve means connecting said first coil with said second discharge line and connecting saidfirst discharge line with said first feed line when said second valve means is in a first position, and said second'valve means connecting said first coil with said'first'feed line when said second valvemeans is ina second-position, whereby when'each of said valve means is in its said first position heated fluid will be discharged through said second discharge line and unheated liquid will be discharged through said first discharge line, and when each of said valve means is in its said second position heated liquid will be discharged through said first and second discharge lines.

2. In a cleaning machine, a piping system having first and second discharge lines and first and second feed lines provided with pump means for producing a flow of liquid through each feed line, a heater having first and second heater coils, a valve means connected between the coils and with both discharge lines for placing the coils in series when said valve means is in a first position, and for connecting the first and second coils with the discharge lines respectively when said valve means is in ,a second position, said second feed line being connected with said second coil, and a second valve means connecting said first coil with said second discharge line and connecting said first discharge line with said first feed line when said second valve means is in a first position, and said second valve means connecting said first coil with said first feed line when said second valve means is in a second position, whereby when each of said valve means is in its .said first position heated fluid will be discharged through said second discharge line and unheated liquid will be discharged through said first discharge line, and when each of said valve means is inits said second position heated liquid will be discharged through said first and second discharge lines, and meansconnecting-both of said valve means for movement in unison from said first position to said second position.

3. In a cleaning machine, a piping system having first and second discharge lines and first and second feed lines provided with pump means for producing a flow of liquid through each feed line, a heater having first and second heater coils, a two position 4-way valve means having ports connected with said first and second coils respectively to thereby connect said coils in series when said valve means is in a first position, and to connect said first and second coils with the discharge lines respectively when said valve means is in a second position, said second feed line being connected with said second coil, and a second two position 4-way valve means having ports connected with said first coil and with said second discharge line and having ports connecting said first discharge line with said first feed line when said second valve means is in first position, and said second valve means connecting said first coil with said first mentioned feed line when said second valve is in a second position, whereby heated fluid will be discharged through said second discharge line and unheated liquid will be discharged through said first discharge line when each of said valve means is in its said first position and heated liquid will be discharged through both discharge lines when each ,of said valve means is in its second position.

4. In a cleaning machine, a piping system having first and second discharge lines and first and second feed lines provided with pump means for producing a flow of liquid through each feed line, a heater having first and second heater coils, a two position 4-way valve means having ports connected with said first and second coils respectively to thereby connect said coils in series when said valve means is in a first position, and to connect said first and second coils with the discharge lines respectively when said valve means is in a second position, said second feed line being connected with said second coil, a second two position 4-way valve means having ports connected with said first coil and with said second discharge line and having ports connecting said first discharge line with said first feed line when said second valve means is in a first position, and said second valve means connecting said first coil with said first mentioned feed line when said second valve is in a second position,

whereby heated liquid will be discharged through said second discharge line and unheated liquid will be discharged through said first discharge line when each of said valve means is in its said first position, and heated liquid will be discharged through both discharge lines when each of said valve means is in its said second posi-. tion, and means connecting both of said valve means for movement in unison from said first position to said second position.

5. In a cleaning machine, a piping system having first and second discharge lines and first and second feed lines provided with pump means for producing a flow of liquid through each feed line, a heater having first and second heater coils, a valve means connected with one end of each of said first and second coils and with said first and second discharge lines, said second feed line being connected with the other end of said second coil, a second valve means connected with the other end of the first coil and with said discharge lines and with said first feed line, whereby when each of said valve means is ar? ranged in one position heated fluid will be discharged through said second discharge line and unheated liquid will be discharged through said first discharge line, and when each of said valve means is arranged in another position heated liquid will be discharged through both discharged lines, a by-pass line connected with each of said feed lines on the outlet side of said pump means, a pressure control valve arranged in each of said bypass lines for by-passing liquid from said feed lines respectively in excess of a desired flow, an electrically operated valve arranged in each of said by-pass lines normally closing said lines, a control switch in circuit with said electrically operated valves, said control switch being movable to positions respectively to close and open the circuit with said electrically operated valves, and means connecting said first and second mentioned valve means and said control switch for movement of said first and second mentioned valve means in unison to said first and second positions and for movement of said switch to its said positions respectively with the movement of said first and second mentioned valve means.

References Cited in the file of this patent UNITED STATES PATENTS 2,451,019 Davis Oct. 12, 1948 2,755,130 Arant July 17, 1956 

